Marine boarding stepladder



FIG. 1 is a front perspective view of a marine boarding stepladder embodying my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation thereof;

The side opposite that shown in FIG. 4 is a mirror image thereof. 

The ornamental design for a marine boarding stepladder, as shown and described. 